| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.launcher3.util; |
| |
| import android.content.Context; |
| import android.content.res.TypedArray; |
| import android.graphics.Color; |
| import android.graphics.ColorMatrix; |
| import android.graphics.drawable.Drawable; |
| |
| /** |
| * Various utility methods associated with theming. |
| */ |
| public class Themes { |
| |
| public static int getColorAccent(Context context) { |
| return getAttrColor(context, android.R.attr.colorAccent); |
| } |
| |
| public static int getAttrColor(Context context, int attr) { |
| TypedArray ta = context.obtainStyledAttributes(new int[]{attr}); |
| int colorAccent = ta.getColor(0, 0); |
| ta.recycle(); |
| return colorAccent; |
| } |
| |
| public static boolean getAttrBoolean(Context context, int attr) { |
| TypedArray ta = context.obtainStyledAttributes(new int[]{attr}); |
| boolean value = ta.getBoolean(0, false); |
| ta.recycle(); |
| return value; |
| } |
| |
| public static Drawable getAttrDrawable(Context context, int attr) { |
| TypedArray ta = context.obtainStyledAttributes(new int[]{attr}); |
| Drawable value = ta.getDrawable(0); |
| ta.recycle(); |
| return value; |
| } |
| |
| /** |
| * Returns the alpha corresponding to the theme attribute {@param attr}, in the range [0, 255]. |
| */ |
| public static int getAlpha(Context context, int attr) { |
| TypedArray ta = context.obtainStyledAttributes(new int[]{attr}); |
| float alpha = ta.getFloat(0, 0); |
| ta.recycle(); |
| return (int) (255 * alpha + 0.5f); |
| } |
| |
| /** |
| * Scales a color matrix such that, when applied to color R G B A, it produces R' G' B' A' where |
| * R' = r * R |
| * G' = g * G |
| * B' = b * B |
| * A' = a * A |
| * |
| * The matrix will, for instance, turn white into r g b a, and black will remain black. |
| * |
| * @param color The color r g b a |
| * @param target The ColorMatrix to scale |
| */ |
| public static void setColorScaleOnMatrix(int color, ColorMatrix target) { |
| target.setScale(Color.red(color) / 255f, Color.green(color) / 255f, |
| Color.blue(color) / 255f, Color.alpha(color) / 255f); |
| } |
| } |